Hood cap for bottles and the like



25, 1934. w. WRIGHT I 3 5 noonc'AP'Fon B'OTTLES AND. THE LIkE I Filed Aug. 3, 5

Patented Dec. 25, 1934 HOOD CAP FOB BOTTLES AND THE LIKE Wilbur L. Wright, Fulton, N. Y., assig'nor to Oswego Falls Corporation,

" poration of New York Fulton, N. Y., a cor- 'Application August 3,1925, Serial No. 41,915

2 Claims. (01. 215-38) This invention relates to paper or like material covers, for containers such as milk bottles and the like, of the pleated skirt or hood cap type, and involves providing the cap skirt with a plastic I binderof the necessary normal hardness or strength to maintain the skirt contracted under the bottle rim and approximately sealed to and around the bottle neck and particularly involves the utilization of binders that are more or less sticky when soft or plastic and that nevertheless possess when set or cool the required normal strength, hardness and other characteristics desirable for hood, cap binding and sealing purposes. Various natural and synthetic waxes, resins and resins, and compositionsthereof, while possessing the necessary qualifications or characteristics for hood cap binding P p ses, are in addition of such a sticky or adhesive nature when in the plastic or soft condition as to objectionably foul glass bottles and bottle cap applying machineryby leaving prohibitory deposits on the glass and metal surfaces.

Under certain circumstances, it is desirable to have the securing or binding portion of the hood cap skirt adhere to the bottle neck surface against which it is crimped to produce a liquidtight seal and a seal of such strength as to hold the cap, during shipment, delivery and handling of the capped bottle, against even such slight loosening as to permit rotation of the cap on the bottle mouth even though the cap skirt remains in its hard set contracted secured or sealed form and condition. However, such adherence of the securing portion of the cap skirt to the glass surface is desirable only where the binder does not leave an objectionable deposit on the glass that renders the bottles unflt for refilling. or that cannot be removed by the dairy bottle washing processes and machinery.

It is an object of,the invention to produce a skirted or hood cap provided with a binder impregnum without suflicient surface coating to leave an objectionable smear or deposit on the glass bottle or on the applying machinery, even though'the binder within the cap skirt is ofa sticky or adhesive nature when soft. or plastic. With this and otherobjects in view,-the invene tion consists of a hood-cap posses-sl sh. lbindeifl of. peculiar characteristics and in the method of 50 producing such cap.

Referring to the accompanying drawing forming a part hereof: g

Fig. 1 shows in side elevation. thenmouth or head portion oil a container such as a glass-so called-milk bottle and a sheet paper hood cap in .described, is drawn from sheet paper by the use a the surplus material is gathered in longitudinal accordance with my invention secured thereon.

Fig. 2 is a sectional elevation of the bottle head and cap of Fig. 1, the cap being shown in vertical section.

Fig. 3 is a detail side elevation of the impregnated paper cap of my invention, before being applied to and molded on the bottle head.

Fig. 4 is a detail vertical section on enlarged scale, showing the bottle head, an ordinary inner paper closure disk seated on the internal seat of 10 the bottle head, and a paper hood cap of my invention molded and set on the bottle head, the binder impregnum within the sheet paper of the capskirt, without bottle-fouling surface coating on the cap skirt, being indicated in an exaggerated manner by stippling.

The glass container a, shown by the drawing, has an exterior annular enlarged head or rim providing an annular downwardly contracting or beveled shoulder or contraction b, and a rounded annular top edge around the bottle mouth or shoulder. The milk bottles of commerce provide an internal annular seat for an ordinary or any suitable flat disk paper closure 0, and, if so desired, bottles of milk can be closed by a closure, such as 0, before the paper hood cap of my invention is applied to and molded on the heads of such bottles.

The sheet paper hood cap 1, as hereinafter 30 of dies to provide the annular flaring skirt 2, preferably formed with longitudinal tucks or folds 3, adapted to more or less tightly overlap each other around the circumference of the skirt when the skirt, when soft or moldable, is radially and annularly compressed and tightly molded to the bottle under the rim. As hereinafter described, the cap is in whole or in part provided with an internal binder impregnum so that at least the skirt will be provided with an annular securi portion 3a, that embodies the sheet paper internally fllled with the binder as indicated by the stippling, Fig. 4, without objectionable exposed coating of binder on the paper surfaces.

The hood cap referred to herein is usually drawn by suitable dies from flexible paper or other fibrous sheet material of the necessary strength and characteristics for hood capping purposes. The cap skirt is of flaring form and creases or pleats and usually ironed out by the operation of the dies in pressing, drawing, or otherwise forming the flat sheet into the desired hood cap with the flaring skirt. The cap is composed of suitable flexible sheet or other paper material or the like, tlmt will permit annular radial contraction of the cap skirt below the rim of the bottle and annular fitting and pressure thereof against and completely around the bottle neck with the provision of means to hold the skirt in such secured position and, if so desired, sealed to and around the bottle neck. This invention involves the provision of securing means for the cap skirt embodying a paper material band or ring embodying a binder impregnum of peculiar characteristics. In the particular ex ample described, the cap skirt, or at least the' securing portion thereof forms the paper material band or ring that carries or embodies the binder as an impregnum, and it is a feature of this invention to provide this paper material band with a binder as an impregnum without a surface coating of binder that might result in objectionable fouling or deposits of binder on the bottle and applying machine surfaces.

In carrying out my invention, a waxlike or resinous binder, possessing the required strength and other characteristics, is reduced to liquid form by heat, and in such form is applied to the skirts of the hood caps, usually to the lower or securing portions of such skirts. The liquid binder is usually applied to each cap skirt by drenching the desired skirt portion with the liquid or by dipping or otherwise, preferably in such manner that a surplus quantity of the binder adheres to the exterior of or remains on the surface of the portion of the skirt that contacts with the liquid.

The cap, after thus receiving the hot liquid binder, is subjected to a so-called heating step on, approximately to the point of saturation, or'

the binder is caused to penetrate the paper material and spread and travel therein, so as to become in fact an impregnum within the paper material. During this heat treatment, exterior surplus liquifled binder on the cap surface that does not penetrate the paper material or is not absorbed thereby because of the saturation of such material or for other reasons, is allowed to travel down the cap skirt and drain or discharge from the bottom edge of such skirt by gravity. This heat treatment of the cap is continued at a temperature sufflciently high to keep the binder, thereon and therein, in liquid form and increase and maintain the tendency of the paper material fibres and structure to internally take up and absorb the liquid binder and the tendency of the liquid to penetrate and spread within the paper material. The purpose is to get the maximum volume or body of binder into the paper material and from the exterior surfaces of the paper, to form the paper with a binder impregnum to approximately the point of saturation, and hence provide a binder impregnum of maximum binding strength and with minimum exterior binder free for deposit on the glass. bottle and metal applying head. The cap after this so-called dewaxing treatment is permitted to cool to climatic temperatures, and the cap skirt embodying the binder impregnum becomes stiff, hard, and more or less rigid. The caps in this condition are stored for shipment to the bottIers. Each can, preparatory to application to the bottle, is re heated to the temperature necessary to render the skirt securing portion that embodies the binder impregnum, soft and moldable. While in this condition, the cap is applied to the bottle mouth, and a suitable head immediately closes around the soft securingportion of the skirt and contacts the same annularly around and against the bottle neck, under the bottle rim, and thus holds the same while said securing portion quickly cools and sets hard in contracted securing form and sealing contact with the bottle neck. If the binder is of a sticky nature when in soft plastic condition, there is no surplusage thereof on the cap skirt to deposit and remain on the bottle neck or on the applying head, even if the sticky nature of the binder may cause the surface of the skirt to seal to and circumferentially around the bottle neck surface in a desirable moisture excluding manner.

By thus providing a hood cap, the skirt of which contains a binder impregnum and no substantial quantity of exposed surplus binder, I am enabled to employ binders of a sticky adhesive nature but otherwise highly desirable in the matter of strength, hardness and other characteristics for my purposes. For instance, any one or several of certain natural and synthetic rosins, resins and waxes, is orare desirable as hood cap binder ingredients, but any surplusage thereof on hood cap skirts will objectionably foul the glass bottle and metal applying head surfaces. However, this objection to such sticky binders is avoided by my instant invention.

Also, hood caps embodying my present invention can be produced and will satisfactorily function with binders composed in whole or in major part of any one of the hard, high melting point waxes, such as camauba, Montan, candelilla. and

ployed with binders as follows; among others namely:

l. A composition of one of the high melting point hard waxes, such as carnauba, Montan, or others, and a natural, or even a synthetic, resin or rosin, say in the proportions of five to twenty per cent rosin, ninety-five to eighty per cent carnauba or other hard wax. The ingredients are melted and mixed together and the resulting binder is of a comparatively highmelting point, although lower than the melting point of the hardwax ingredient, and produces a water-resisting strong hard binder that is of an increasingly sticky nature when plastic for molding where more than approximately five per cent of rosin is employed.

2. A composition of a hard high-melting point wax, such as carnauba; a natural or synthetic rosin or resin, such as natural rosin; and a soft low-melting-point paper-penetrating wax, such as paraflin, in approximately the proportions of camauba 1 part, rosin 5 parts, paraffin 5 parts,

mixed together and melted with a small quantity.

'and mixed together in approximately the proportionsof rosin grams; paraffin 86 grams: and magnesium sulphate 4 grams. These proportions are but illustrative and can be substantially varied.

The hood cap herein referred to is composed of paper or substantially like material of single ply or in one piece, as distinguished from laminated material built up of several superimposed sheets of diflerent materials or of diiferent characteristics.

What I claim is:--

1. A single-thickness sheet-paper material hood cap disk, at least the annular hood-cap-securing skirt portion of which carries a high melting point skirt-stiffening binder that is sumciently adhesive on glass to be normally glass fouling when in a substantially fused state, said binder constituting an impregnum located wholly within the single-thickness paper, whereby said skirt carrying said internal binder will strip or peel from glass surfaces without fouling the same.

2. The method of producing a paper hoodcap provided with a normally hard paper-stiifening binder contained within the fibrous mass of the paper without exterior glass-fouling binder deposits, rendering the binder impregnated portions of the paper soft and moldable and non-glassiouling when heated, and quick-setting to still hard condition by cooling; which method includes providing at least the annular securing portion of the paper hood cap skirt with an exterior adhering surplus quantity of the binder in a fused liquid condition. and subjecting thesame to continued heat treatment at a temperature sumciently high to-maintain the liquidity of the binder and the absorption capacity of the paper and the penetration of the liquid, to drive the maximum volume of liquid into the paper to the approximate point of saturation and from the exterior surfaces thereof. while draining exterior unabsorbed liquid therefrom, with the end in view of eliminating exterior exposed glass-fouling binder.

WILBUR L. WRIGHT. 

